// Copyright (c) Brock Allen & Dominick Baier. All rights reserved.
// Licensed under the Apache License, Version 2.0. See LICENSE in the project root for license information.


using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Filters;

namespace ZFY.UMC.Identity
{
    public class SecurityHeadersAttribute : ActionFilterAttribute
    {
        public override void OnResultExecuting(ResultExecutingContext context)
        {
            //var result = context.Result;
            //if (result is ViewResult)
            //{
            //    // https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Content-Type-Options
            //    if (!context.HttpContext.Response.Headers.ContainsKey("X-Content-Type-Options"))
            //    {
            //        context.HttpContext.Response.Headers.Add("X-Content-Type-Options", "nosniff");
            //    }

            //    // https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Frame-Options
            //    if (!context.HttpContext.Response.Headers.ContainsKey("X-Frame-Options"))
            //    {
            //        context.HttpContext.Response.Headers.Add("X-Frame-Options", "SAMEORIGIN");
            //    }

            //    // https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy
            //    var csp = "default-src 'self'; object-src 'none'; frame-ancestors 'none'; sandbox allow-forms allow-same-origin allow-scripts; base-uri 'self';";
            //    // also consider adding upgrade-insecure-requests once you have HTTPS in place for production
            //    //csp += "upgrade-insecure-requests;";
            //    // also an example if you need client images to be displayed from twitter
            //    // csp += "img-src 'self' https://pbs.twimg.com;";

            //    // once for standards compliant browsers
            //    if (!context.HttpContext.Response.Headers.ContainsKey("Content-Security-Policy"))
            //    {
            //        context.HttpContext.Response.Headers.Add("Content-Security-Policy", csp);
            //    }
            //    // and once again for IE
            //    if (!context.HttpContext.Response.Headers.ContainsKey("X-Content-Security-Policy"))
            //    {
            //        context.HttpContext.Response.Headers.Add("X-Content-Security-Policy", csp);
            //    }

            //    // https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Referrer-Policy
            //    var referrer_policy = "no-referrer";
            //    if (!context.HttpContext.Response.Headers.ContainsKey("Referrer-Policy"))
            //    {
            //        context.HttpContext.Response.Headers.Add("Referrer-Policy", referrer_policy);
            //    }
            //}
        }
    }
}
